[linux-2.6-block.git] / net / mptcp / protocol.h

/* SPDX-License-Identifier: GPL-2.0 */
/* Multipath TCP
 *
 * Copyright (c) 2017 - 2019, Intel Corporation.
 */

#ifndef __MPTCP_PROTOCOL_H
#define __MPTCP_PROTOCOL_H

#include <linux/random.h>
#include <net/tcp.h>
#include <net/inet_connection_sock.h>

#define MPTCP_SUPPORTED_VERSION	1

/* MPTCP option bits */
#define OPTION_MPTCP_MPC_SYN	BIT(0)
#define OPTION_MPTCP_MPC_SYNACK	BIT(1)
#define OPTION_MPTCP_MPC_ACK	BIT(2)
#define OPTION_MPTCP_MPJ_SYN	BIT(3)
#define OPTION_MPTCP_MPJ_SYNACK	BIT(4)
#define OPTION_MPTCP_MPJ_ACK	BIT(5)
#define OPTION_MPTCP_ADD_ADDR	BIT(6)
#define OPTION_MPTCP_ADD_ADDR6	BIT(7)
#define OPTION_MPTCP_RM_ADDR	BIT(8)

/* MPTCP option subtypes */
#define MPTCPOPT_MP_CAPABLE	0
#define MPTCPOPT_MP_JOIN	1
#define MPTCPOPT_DSS		2
#define MPTCPOPT_ADD_ADDR	3
#define MPTCPOPT_RM_ADDR	4
#define MPTCPOPT_MP_PRIO	5
#define MPTCPOPT_MP_FAIL	6
#define MPTCPOPT_MP_FASTCLOSE	7

/* MPTCP suboption lengths */
#define TCPOLEN_MPTCP_MPC_SYN		4
#define TCPOLEN_MPTCP_MPC_SYNACK	12
#define TCPOLEN_MPTCP_MPC_ACK		20
#define TCPOLEN_MPTCP_MPC_ACK_DATA	22
#define TCPOLEN_MPTCP_MPJ_SYN		12
#define TCPOLEN_MPTCP_MPJ_SYNACK	16
#define TCPOLEN_MPTCP_MPJ_ACK		24
#define TCPOLEN_MPTCP_DSS_BASE		4
#define TCPOLEN_MPTCP_DSS_ACK32		4
#define TCPOLEN_MPTCP_DSS_ACK64		8
#define TCPOLEN_MPTCP_DSS_MAP32		10
#define TCPOLEN_MPTCP_DSS_MAP64		14
#define TCPOLEN_MPTCP_DSS_CHECKSUM	2
#define TCPOLEN_MPTCP_ADD_ADDR		16
#define TCPOLEN_MPTCP_ADD_ADDR_PORT	18
#define TCPOLEN_MPTCP_ADD_ADDR_BASE	8
#define TCPOLEN_MPTCP_ADD_ADDR_BASE_PORT	10
#define TCPOLEN_MPTCP_ADD_ADDR6		28
#define TCPOLEN_MPTCP_ADD_ADDR6_PORT	30
#define TCPOLEN_MPTCP_ADD_ADDR6_BASE	20
#define TCPOLEN_MPTCP_ADD_ADDR6_BASE_PORT	22
#define TCPOLEN_MPTCP_PORT_LEN		2
#define TCPOLEN_MPTCP_RM_ADDR_BASE	4

/* MPTCP MP_JOIN flags */
#define MPTCPOPT_BACKUP		BIT(0)
#define MPTCPOPT_HMAC_LEN	20
#define MPTCPOPT_THMAC_LEN	8

/* MPTCP MP_CAPABLE flags */
#define MPTCP_VERSION_MASK	(0x0F)
#define MPTCP_CAP_CHECKSUM_REQD	BIT(7)
#define MPTCP_CAP_EXTENSIBILITY	BIT(6)
#define MPTCP_CAP_HMAC_SHA256	BIT(0)
#define MPTCP_CAP_FLAG_MASK	(0x3F)

/* MPTCP DSS flags */
#define MPTCP_DSS_DATA_FIN	BIT(4)
#define MPTCP_DSS_DSN64		BIT(3)
#define MPTCP_DSS_HAS_MAP	BIT(2)
#define MPTCP_DSS_ACK64		BIT(1)
#define MPTCP_DSS_HAS_ACK	BIT(0)
#define MPTCP_DSS_FLAG_MASK	(0x1F)

/* MPTCP ADD_ADDR flags */
#define MPTCP_ADDR_ECHO		BIT(0)
#define MPTCP_ADDR_IPVERSION_4	4
#define MPTCP_ADDR_IPVERSION_6	6

/* MPTCP socket flags */
#define MPTCP_DATA_READY	0
#define MPTCP_SEND_SPACE	1
#define MPTCP_WORK_RTX		2
#define MPTCP_WORK_EOF		3
#define MPTCP_FALLBACK_DONE	4
#define MPTCP_WORK_CLOSE_SUBFLOW 5

struct mptcp_options_received {
	u64	sndr_key;
	u64	rcvr_key;
	u64	data_ack;
	u64	data_seq;
	u32	subflow_seq;
	u16	data_len;
	u16	mp_capable : 1,
		mp_join : 1,
		dss : 1,
		add_addr : 1,
		rm_addr : 1,
		family : 4,
		echo : 1,
		backup : 1;
	u32	token;
	u32	nonce;
	u64	thmac;
	u8	hmac[20];
	u8	join_id;
	u8	use_map:1,
		dsn64:1,
		data_fin:1,
		use_ack:1,
		ack64:1,
		mpc_map:1,
		__unused:2;
	u8	addr_id;
	u8	rm_id;
	union {
		struct in_addr	addr;
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
		struct in6_addr	addr6;
#endif
	};
	u64	ahmac;
	u16	port;
};

static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field)
{
	return htonl((TCPOPT_MPTCP << 24) | (len << 16) | (subopt << 12) |
		     ((nib & 0xF) << 8) | field);
}

struct mptcp_addr_info {
	sa_family_t		family;
	__be16			port;
	u8			id;
	u8			flags;
	int			ifindex;
	union {
		struct in_addr addr;
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
		struct in6_addr addr6;
#endif
	};
};

enum mptcp_pm_status {
	MPTCP_PM_ADD_ADDR_RECEIVED,
	MPTCP_PM_RM_ADDR_RECEIVED,
	MPTCP_PM_ESTABLISHED,
	MPTCP_PM_SUBFLOW_ESTABLISHED,
};

struct mptcp_pm_data {
	struct mptcp_addr_info local;
	struct mptcp_addr_info remote;
	struct list_head anno_list;

	spinlock_t	lock;		/*protects the whole PM data */

	bool		add_addr_signal;
	bool		rm_addr_signal;
	bool		server_side;
	bool		work_pending;
	bool		accept_addr;
	bool		accept_subflow;
	bool		add_addr_echo;
	u8		add_addr_signaled;
	u8		add_addr_accepted;
	u8		local_addr_used;
	u8		subflows;
	u8		add_addr_signal_max;
	u8		add_addr_accept_max;
	u8		local_addr_max;
	u8		subflows_max;
	u8		status;
	u8		rm_id;
};

struct mptcp_data_frag {
	struct list_head list;
	u64 data_seq;
	u16 data_len;
	u16 offset;
	u16 overhead;
	u16 already_sent;
	struct page *page;
};

/* MPTCP connection sock */
struct mptcp_sock {
	/* inet_connection_sock must be the first member */
	struct inet_connection_sock sk;
	u64		local_key;
	u64		remote_key;
	u64		write_seq;
	u64		ack_seq;
	u64		rcv_data_fin_seq;
	struct sock	*last_snd;
	int		snd_burst;
	atomic64_t	snd_una;
	unsigned long	timer_ival;
	u32		token;
	unsigned long	flags;
	bool		can_ack;
	bool		fully_established;
	bool		rcv_data_fin;
	bool		snd_data_fin_enable;
	bool		use_64bit_ack; /* Set when we received a 64-bit DSN */
	spinlock_t	join_list_lock;
	struct work_struct work;
	struct sk_buff  *ooo_last_skb;
	struct rb_root  out_of_order_queue;
	struct list_head conn_list;
	struct list_head rtx_queue;
	struct mptcp_data_frag *first_pending;
	struct list_head join_list;
	struct skb_ext	*cached_ext;	/* for the next sendmsg */
	struct socket	*subflow; /* outgoing connect/listener/!mp_capable */
	struct sock	*first;
	struct mptcp_pm_data	pm;
	struct {
		u32	space;	/* bytes copied in last measurement window */
		u32	copied; /* bytes copied in this measurement window */
		u64	time;	/* start time of measurement window */
		u64	rtt_us; /* last maximum rtt of subflows */
	} rcvq_space;
};

#define mptcp_for_each_subflow(__msk, __subflow)			\
	list_for_each_entry(__subflow, &((__msk)->conn_list), node)

static inline struct mptcp_sock *mptcp_sk(const struct sock *sk)
{
	return (struct mptcp_sock *)sk;
}

static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk)
{
	const struct mptcp_sock *msk = mptcp_sk(sk);

	return READ_ONCE(msk->first_pending);
}

static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk)
{
	struct mptcp_sock *msk = mptcp_sk(sk);
	struct mptcp_data_frag *cur;

	cur = msk->first_pending;
	return list_is_last(&cur->list, &msk->rtx_queue) ? NULL :
						     list_next_entry(cur, list);
}

static inline struct mptcp_data_frag *mptcp_pending_tail(const struct sock *sk)
{
	struct mptcp_sock *msk = mptcp_sk(sk);

	if (!msk->first_pending)
		return NULL;

	if (WARN_ON_ONCE(list_empty(&msk->rtx_queue)))
		return NULL;

	return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list);
}

static inline struct mptcp_data_frag *mptcp_rtx_tail(const struct sock *sk)
{
	struct mptcp_sock *msk = mptcp_sk(sk);

	if (list_empty(&msk->rtx_queue))
		return NULL;

	return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list);
}

static inline struct mptcp_data_frag *mptcp_rtx_head(const struct sock *sk)
{
	struct mptcp_sock *msk = mptcp_sk(sk);

	return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list);
}

struct mptcp_subflow_request_sock {
	struct	tcp_request_sock sk;
	u16	mp_capable : 1,
		mp_join : 1,
		backup : 1;
	u8	local_id;
	u8	remote_id;
	u64	local_key;
	u64	idsn;
	u32	token;
	u32	ssn_offset;
	u64	thmac;
	u32	local_nonce;
	u32	remote_nonce;
	struct mptcp_sock	*msk;
	struct hlist_nulls_node token_node;
};

static inline struct mptcp_subflow_request_sock *
mptcp_subflow_rsk(const struct request_sock *rsk)
{
	return (struct mptcp_subflow_request_sock *)rsk;
}

enum mptcp_data_avail {
	MPTCP_SUBFLOW_NODATA,
	MPTCP_SUBFLOW_DATA_AVAIL,
	MPTCP_SUBFLOW_OOO_DATA
};

/* MPTCP subflow context */
struct mptcp_subflow_context {
	struct	list_head node;/* conn_list of subflows */
	u64	local_key;
	u64	remote_key;
	u64	idsn;
	u64	map_seq;
	u32	snd_isn;
	u32	token;
	u32	rel_write_seq;
	u32	map_subflow_seq;
	u32	ssn_offset;
	u32	map_data_len;
	u32	request_mptcp : 1,  /* send MP_CAPABLE */
		request_join : 1,   /* send MP_JOIN */
		request_bkup : 1,
		mp_capable : 1,	    /* remote is MPTCP capable */
		mp_join : 1,	    /* remote is JOINing */
		fully_established : 1,	    /* path validated */
		pm_notified : 1,    /* PM hook called for established status */
		conn_finished : 1,
		map_valid : 1,
		mpc_map : 1,
		backup : 1,
		rx_eof : 1,
		can_ack : 1;	    /* only after processing the remote a key */
	enum mptcp_data_avail data_avail;
	u32	remote_nonce;
	u64	thmac;
	u32	local_nonce;
	u32	remote_token;
	u8	hmac[MPTCPOPT_HMAC_LEN];
	u8	local_id;
	u8	remote_id;

	struct	sock *tcp_sock;	    /* tcp sk backpointer */
	struct	sock *conn;	    /* parent mptcp_sock */
	const	struct inet_connection_sock_af_ops *icsk_af_ops;
	void	(*tcp_data_ready)(struct sock *sk);
	void	(*tcp_state_change)(struct sock *sk);
	void	(*tcp_write_space)(struct sock *sk);

	struct	rcu_head rcu;
};

static inline struct mptcp_subflow_context *
mptcp_subflow_ctx(const struct sock *sk)
{
	struct inet_connection_sock *icsk = inet_csk(sk);

	/* Use RCU on icsk_ulp_data only for sock diag code */
	return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data;
}

static inline struct sock *
mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow)
{
	return subflow->tcp_sock;
}

static inline u64
mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow)
{
	return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq -
		      subflow->ssn_offset -
		      subflow->map_subflow_seq;
}

static inline u64
mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow)
{
	return subflow->map_seq + mptcp_subflow_get_map_offset(subflow);
}

int mptcp_is_enabled(struct net *net);
unsigned int mptcp_get_add_addr_timeout(struct net *net);
void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow,
				     struct mptcp_options_received *mp_opt);
bool mptcp_subflow_data_available(struct sock *sk);
void __init mptcp_subflow_init(void);
void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how);
void __mptcp_close_ssk(struct sock *sk, struct sock *ssk,
		       struct mptcp_subflow_context *subflow,
		       long timeout);
void mptcp_subflow_reset(struct sock *ssk);

/* called with sk socket lock held */
int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc,
			    const struct mptcp_addr_info *remote);
int mptcp_subflow_create_socket(struct sock *sk, struct socket **new_sock);

static inline void mptcp_subflow_tcp_fallback(struct sock *sk,
					      struct mptcp_subflow_context *ctx)
{
	sk->sk_data_ready = ctx->tcp_data_ready;
	sk->sk_state_change = ctx->tcp_state_change;
	sk->sk_write_space = ctx->tcp_write_space;

	inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops;
}

void __init mptcp_proto_init(void);
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
int __init mptcp_proto_v6_init(void);
#endif

struct sock *mptcp_sk_clone(const struct sock *sk,
			    const struct mptcp_options_received *mp_opt,
			    struct request_sock *req);
void mptcp_get_options(const struct sk_buff *skb,
		       struct mptcp_options_received *mp_opt);

void mptcp_finish_connect(struct sock *sk);
static inline bool mptcp_is_fully_established(struct sock *sk)
{
	return inet_sk_state_load(sk) == TCP_ESTABLISHED &&
	       READ_ONCE(mptcp_sk(sk)->fully_established);
}
void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk);
void mptcp_data_ready(struct sock *sk, struct sock *ssk);
bool mptcp_finish_join(struct sock *sk);
bool mptcp_schedule_work(struct sock *sk);
void mptcp_data_acked(struct sock *sk);
void mptcp_subflow_eof(struct sock *sk);
bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit);
void mptcp_destroy_common(struct mptcp_sock *msk);

void __init mptcp_token_init(void);
static inline void mptcp_token_init_request(struct request_sock *req)
{
	mptcp_subflow_rsk(req)->token_node.pprev = NULL;
}

int mptcp_token_new_request(struct request_sock *req);
void mptcp_token_destroy_request(struct request_sock *req);
int mptcp_token_new_connect(struct sock *sk);
void mptcp_token_accept(struct mptcp_subflow_request_sock *r,
			struct mptcp_sock *msk);
bool mptcp_token_exists(u32 token);
struct mptcp_sock *mptcp_token_get_sock(u32 token);
struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot,
					 long *s_num);
void mptcp_token_destroy(struct mptcp_sock *msk);

void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn);

void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac);

void __init mptcp_pm_init(void);
void mptcp_pm_data_init(struct mptcp_sock *msk);
void mptcp_pm_new_connection(struct mptcp_sock *msk, int server_side);
void mptcp_pm_fully_established(struct mptcp_sock *msk);
bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk);
void mptcp_pm_connection_closed(struct mptcp_sock *msk);
void mptcp_pm_subflow_established(struct mptcp_sock *msk,
				  struct mptcp_subflow_context *subflow);
void mptcp_pm_subflow_closed(struct mptcp_sock *msk, u8 id);
void mptcp_pm_add_addr_received(struct mptcp_sock *msk,
				const struct mptcp_addr_info *addr);
void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, u8 rm_id);
void mptcp_pm_free_anno_list(struct mptcp_sock *msk);
struct mptcp_pm_add_entry *
mptcp_pm_del_add_timer(struct mptcp_sock *msk,
		       struct mptcp_addr_info *addr);

int mptcp_pm_announce_addr(struct mptcp_sock *msk,
			   const struct mptcp_addr_info *addr,
			   bool echo);
int mptcp_pm_remove_addr(struct mptcp_sock *msk, u8 local_id);
int mptcp_pm_remove_subflow(struct mptcp_sock *msk, u8 local_id);

static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk)
{
	return READ_ONCE(msk->pm.add_addr_signal);
}

static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk)
{
	return READ_ONCE(msk->pm.rm_addr_signal);
}

static inline unsigned int mptcp_add_addr_len(int family, bool echo)
{
	if (family == AF_INET)
		return echo ? TCPOLEN_MPTCP_ADD_ADDR_BASE
			    : TCPOLEN_MPTCP_ADD_ADDR;
	return echo ? TCPOLEN_MPTCP_ADD_ADDR6_BASE : TCPOLEN_MPTCP_ADD_ADDR6;
}

bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
			      struct mptcp_addr_info *saddr, bool *echo);
bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
			     u8 *rm_id);
int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);

void __init mptcp_pm_nl_init(void);
void mptcp_pm_nl_data_init(struct mptcp_sock *msk);
void mptcp_pm_nl_fully_established(struct mptcp_sock *msk);
void mptcp_pm_nl_subflow_established(struct mptcp_sock *msk);
void mptcp_pm_nl_add_addr_received(struct mptcp_sock *msk);
void mptcp_pm_nl_rm_addr_received(struct mptcp_sock *msk);
void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk, u8 rm_id);
int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);

static inline struct mptcp_ext *mptcp_get_ext(struct sk_buff *skb)
{
	return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP);
}

static inline bool before64(__u64 seq1, __u64 seq2)
{
	return (__s64)(seq1 - seq2) < 0;
}

#define after64(seq2, seq1)	before64(seq1, seq2)

void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops);

static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk)
{
	return test_bit(MPTCP_FALLBACK_DONE, &msk->flags);
}

static inline bool mptcp_check_fallback(const struct sock *sk)
{
	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
	struct mptcp_sock *msk = mptcp_sk(subflow->conn);

	return __mptcp_check_fallback(msk);
}

static inline void __mptcp_do_fallback(struct mptcp_sock *msk)
{
	if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) {
		pr_debug("TCP fallback already done (msk=%p)", msk);
		return;
	}
	set_bit(MPTCP_FALLBACK_DONE, &msk->flags);
}

static inline void mptcp_do_fallback(struct sock *sk)
{
	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
	struct mptcp_sock *msk = mptcp_sk(subflow->conn);

	__mptcp_do_fallback(msk);
}

#define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a)

static inline bool subflow_simultaneous_connect(struct sock *sk)
{
	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
	struct sock *parent = subflow->conn;

	return sk->sk_state == TCP_ESTABLISHED &&
	       !mptcp_sk(parent)->pm.server_side &&
	       !subflow->conn_finished;
}

#ifdef CONFIG_SYN_COOKIES
void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req,
				       struct sk_buff *skb);
bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req,
					struct sk_buff *skb);
void __init mptcp_join_cookie_init(void);
#else
static inline void
subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req,
				  struct sk_buff *skb) {}
static inline bool
mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req,
				   struct sk_buff *skb)
{
	return false;
}

static inline void mptcp_join_cookie_init(void) {}
#endif

#endif /* __MPTCP_PROTOCOL_H */
Commit	Line	Data
f870fa0b MM	1	/* SPDX-License-Identifier: GPL-2.0 */
	2	/* Multipath TCP
	3	*
	4	* Copyright (c) 2017 - 2019, Intel Corporation.
	5	*/
	6
	7	#ifndef __MPTCP_PROTOCOL_H
	8	#define __MPTCP_PROTOCOL_H
	9
79c0949e PK	10	#include <linux/random.h>
	11	#include <net/tcp.h>
	12	#include <net/inet_connection_sock.h>
	13
cc7972ea	14	#define MPTCP_SUPPORTED_VERSION 1
eda7acdd PK	15
	16	/* MPTCP option bits */
	17	#define OPTION_MPTCP_MPC_SYN BIT(0)
	18	#define OPTION_MPTCP_MPC_SYNACK BIT(1)
	19	#define OPTION_MPTCP_MPC_ACK BIT(2)
f296234c PK	20	#define OPTION_MPTCP_MPJ_SYN BIT(3)
	21	#define OPTION_MPTCP_MPJ_SYNACK BIT(4)
	22	#define OPTION_MPTCP_MPJ_ACK BIT(5)
3df523ab PK	23	#define OPTION_MPTCP_ADD_ADDR BIT(6)
	24	#define OPTION_MPTCP_ADD_ADDR6 BIT(7)
	25	#define OPTION_MPTCP_RM_ADDR BIT(8)
eda7acdd PK	26
	27	/* MPTCP option subtypes */
	28	#define MPTCPOPT_MP_CAPABLE 0
	29	#define MPTCPOPT_MP_JOIN 1
	30	#define MPTCPOPT_DSS 2
	31	#define MPTCPOPT_ADD_ADDR 3
	32	#define MPTCPOPT_RM_ADDR 4
	33	#define MPTCPOPT_MP_PRIO 5
	34	#define MPTCPOPT_MP_FAIL 6
	35	#define MPTCPOPT_MP_FASTCLOSE 7
	36
	37	/* MPTCP suboption lengths */
cc7972ea	38	#define TCPOLEN_MPTCP_MPC_SYN 4
eda7acdd PK	39	#define TCPOLEN_MPTCP_MPC_SYNACK 12
eda7acdd PK	40	#define TCPOLEN_MPTCP_MPC_ACK 20
cc7972ea	41	#define TCPOLEN_MPTCP_MPC_ACK_DATA 22
f296234c PK	42	#define TCPOLEN_MPTCP_MPJ_SYN 12
	43	#define TCPOLEN_MPTCP_MPJ_SYNACK 16
	44	#define TCPOLEN_MPTCP_MPJ_ACK 24
6d0060f6	45	#define TCPOLEN_MPTCP_DSS_BASE 4
648ef4b8	46	#define TCPOLEN_MPTCP_DSS_ACK32 4
6d0060f6	47	#define TCPOLEN_MPTCP_DSS_ACK64 8
648ef4b8	48	#define TCPOLEN_MPTCP_DSS_MAP32 10
6d0060f6 MM	49	#define TCPOLEN_MPTCP_DSS_MAP64 14
6d0060f6 MM	50	#define TCPOLEN_MPTCP_DSS_CHECKSUM 2
3df523ab PK	51	#define TCPOLEN_MPTCP_ADD_ADDR 16
	52	#define TCPOLEN_MPTCP_ADD_ADDR_PORT 18
	53	#define TCPOLEN_MPTCP_ADD_ADDR_BASE 8
	54	#define TCPOLEN_MPTCP_ADD_ADDR_BASE_PORT 10
	55	#define TCPOLEN_MPTCP_ADD_ADDR6 28
	56	#define TCPOLEN_MPTCP_ADD_ADDR6_PORT 30
	57	#define TCPOLEN_MPTCP_ADD_ADDR6_BASE 20
	58	#define TCPOLEN_MPTCP_ADD_ADDR6_BASE_PORT 22
	59	#define TCPOLEN_MPTCP_PORT_LEN 2
	60	#define TCPOLEN_MPTCP_RM_ADDR_BASE 4
eda7acdd	61
ec3edaa7	62	/* MPTCP MP_JOIN flags */
f296234c PK	63	#define MPTCPOPT_BACKUP BIT(0)
f296234c PK	64	#define MPTCPOPT_HMAC_LEN 20
ec3edaa7	65	#define MPTCPOPT_THMAC_LEN 8
f296234c	66
eda7acdd PK	67	/* MPTCP MP_CAPABLE flags */
	68	#define MPTCP_VERSION_MASK (0x0F)
	69	#define MPTCP_CAP_CHECKSUM_REQD BIT(7)
	70	#define MPTCP_CAP_EXTENSIBILITY BIT(6)
65492c5a	71	#define MPTCP_CAP_HMAC_SHA256 BIT(0)
eda7acdd PK	72	#define MPTCP_CAP_FLAG_MASK (0x3F)
eda7acdd PK	73
6d0060f6 MM	74	/* MPTCP DSS flags */
	75	#define MPTCP_DSS_DATA_FIN BIT(4)
	76	#define MPTCP_DSS_DSN64 BIT(3)
	77	#define MPTCP_DSS_HAS_MAP BIT(2)
	78	#define MPTCP_DSS_ACK64 BIT(1)
	79	#define MPTCP_DSS_HAS_ACK BIT(0)
648ef4b8 MM	80	#define MPTCP_DSS_FLAG_MASK (0x1F)
648ef4b8 MM	81
3df523ab PK	82	/* MPTCP ADD_ADDR flags */
3df523ab PK	83	#define MPTCP_ADDR_ECHO BIT(0)
3df523ab PK	84	#define MPTCP_ADDR_IPVERSION_4 4
	85	#define MPTCP_ADDR_IPVERSION_6 6
	86
648ef4b8	87	/* MPTCP socket flags */
d99bfed5 FW	88	#define MPTCP_DATA_READY 0
d99bfed5 FW	89	#define MPTCP_SEND_SPACE 1
3b1d6210	90	#define MPTCP_WORK_RTX 2
59832e24	91	#define MPTCP_WORK_EOF 3
e1ff9e82	92	#define MPTCP_FALLBACK_DONE 4
0e4f35d7	93	#define MPTCP_WORK_CLOSE_SUBFLOW 5
6d0060f6	94
cfde141e PA	95	struct mptcp_options_received {
	96	u64 sndr_key;
	97	u64 rcvr_key;
	98	u64 data_ack;
	99	u64 data_seq;
	100	u32 subflow_seq;
	101	u16 data_len;
	102	u16 mp_capable : 1,
	103	mp_join : 1,
	104	dss : 1,
	105	add_addr : 1,
	106	rm_addr : 1,
	107	family : 4,
	108	echo : 1,
	109	backup : 1;
	110	u32 token;
	111	u32 nonce;
	112	u64 thmac;
	113	u8 hmac[20];
	114	u8 join_id;
	115	u8 use_map:1,
	116	dsn64:1,
	117	data_fin:1,
	118	use_ack:1,
	119	ack64:1,
	120	mpc_map:1,
	121	__unused:2;
	122	u8 addr_id;
	123	u8 rm_id;
	124	union {
	125	struct in_addr addr;
	126	#if IS_ENABLED(CONFIG_MPTCP_IPV6)
	127	struct in6_addr addr6;
	128	#endif
	129	};
	130	u64 ahmac;
	131	u16 port;
	132	};
	133
3df523ab PK	134	static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field)
	135	{
	136	return htonl((TCPOPT_MPTCP << 24) \| (len << 16) \| (subopt << 12) \|
	137	((nib & 0xF) << 8) \| field);
	138	}
	139
1b1c7a0e PK	140	struct mptcp_addr_info {
	141	sa_family_t family;
	142	__be16 port;
	143	u8 id;
ef0da3b8 PA	144	u8 flags;
ef0da3b8 PA	145	int ifindex;
1b1c7a0e PK	146	union {
	147	struct in_addr addr;
	148	#if IS_ENABLED(CONFIG_MPTCP_IPV6)
	149	struct in6_addr addr6;
	150	#endif
	151	};
	152	};
	153
	154	enum mptcp_pm_status {
	155	MPTCP_PM_ADD_ADDR_RECEIVED,
d0876b22	156	MPTCP_PM_RM_ADDR_RECEIVED,
1b1c7a0e PK	157	MPTCP_PM_ESTABLISHED,
	158	MPTCP_PM_SUBFLOW_ESTABLISHED,
	159	};
	160
	161	struct mptcp_pm_data {
	162	struct mptcp_addr_info local;
	163	struct mptcp_addr_info remote;
b6c08380	164	struct list_head anno_list;
1b1c7a0e PK	165
	166	spinlock_t lock; /protects the whole PM data /
	167
f643b803	168	bool add_addr_signal;
5cb104ae	169	bool rm_addr_signal;
1b1c7a0e PK	170	bool server_side;
	171	bool work_pending;
	172	bool accept_addr;
	173	bool accept_subflow;
6a6c05a8	174	bool add_addr_echo;
1b1c7a0e PK	175	u8 add_addr_signaled;
	176	u8 add_addr_accepted;
	177	u8 local_addr_used;
	178	u8 subflows;
	179	u8 add_addr_signal_max;
	180	u8 add_addr_accept_max;
	181	u8 local_addr_max;
	182	u8 subflows_max;
	183	u8 status;
5cb104ae	184	u8 rm_id;
1b1c7a0e PK	185	};
1b1c7a0e PK	186
18b683bf PA	187	struct mptcp_data_frag {
	188	struct list_head list;
	189	u64 data_seq;
f0e6a4cf PA	190	u16 data_len;
	191	u16 offset;
	192	u16 overhead;
	193	u16 already_sent;
18b683bf PA	194	struct page *page;
	195	};
	196
f870fa0b MM	197	/* MPTCP connection sock */
	198	struct mptcp_sock {
	199	/* inet_connection_sock must be the first member */
	200	struct inet_connection_sock sk;
cec37a6e PK	201	u64 local_key;
cec37a6e PK	202	u64 remote_key;
6d0060f6 MM	203	u64 write_seq;
6d0060f6 MM	204	u64 ack_seq;
3721b9b6	205	u64 rcv_data_fin_seq;
d5f49190 PA	206	struct sock *last_snd;
d5f49190 PA	207	int snd_burst;
cc9d2566	208	atomic64_t snd_una;
b51f9b80	209	unsigned long timer_ival;
79c0949e	210	u32 token;
648ef4b8	211	unsigned long flags;
d22f4988	212	bool can_ack;
b93df08c	213	bool fully_established;
3721b9b6	214	bool rcv_data_fin;
7279da61	215	bool snd_data_fin_enable;
37198e93	216	bool use_64bit_ack; /* Set when we received a 64-bit DSN */
ec3edaa7	217	spinlock_t join_list_lock;
80992017	218	struct work_struct work;
ab174ad8 PA	219	struct sk_buff *ooo_last_skb;
ab174ad8 PA	220	struct rb_root out_of_order_queue;
cec37a6e	221	struct list_head conn_list;
18b683bf	222	struct list_head rtx_queue;
f0e6a4cf	223	struct mptcp_data_frag *first_pending;
ec3edaa7	224	struct list_head join_list;
6d0060f6	225	struct skb_ext cached_ext; / for the next sendmsg */
f870fa0b	226	struct socket subflow; / outgoing connect/listener/!mp_capable */
8ab183de	227	struct sock *first;
1b1c7a0e	228	struct mptcp_pm_data pm;
a6b118fe FW	229	struct {
	230	u32 space; /* bytes copied in last measurement window */
	231	u32 copied; /* bytes copied in this measurement window */
	232	u64 time; /* start time of measurement window */
	233	u64 rtt_us; /* last maximum rtt of subflows */
	234	} rcvq_space;
f870fa0b MM	235	};
f870fa0b MM	236
cec37a6e PK	237	#define mptcp_for_each_subflow(__msk, __subflow) \
	238	list_for_each_entry(__subflow, &((__msk)->conn_list), node)
	239
f870fa0b MM	240	static inline struct mptcp_sock mptcp_sk(const struct sock sk)
	241	{
	242	return (struct mptcp_sock *)sk;
	243	}
	244
f0e6a4cf PA	245	static inline struct mptcp_data_frag mptcp_send_head(const struct sock sk)
	246	{
	247	const struct mptcp_sock *msk = mptcp_sk(sk);
	248
	249	return READ_ONCE(msk->first_pending);
	250	}
	251
	252	static inline struct mptcp_data_frag mptcp_send_next(struct sock sk)
	253	{
	254	struct mptcp_sock *msk = mptcp_sk(sk);
	255	struct mptcp_data_frag *cur;
	256
	257	cur = msk->first_pending;
	258	return list_is_last(&cur->list, &msk->rtx_queue) ? NULL :
	259	list_next_entry(cur, list);
	260	}
	261
	262	static inline struct mptcp_data_frag mptcp_pending_tail(const struct sock sk)
	263	{
	264	struct mptcp_sock *msk = mptcp_sk(sk);
	265
	266	if (!msk->first_pending)
	267	return NULL;
	268
	269	if (WARN_ON_ONCE(list_empty(&msk->rtx_queue)))
	270	return NULL;
	271
	272	return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list);
	273	}
	274
18b683bf PA	275	static inline struct mptcp_data_frag mptcp_rtx_tail(const struct sock sk)
	276	{
	277	struct mptcp_sock *msk = mptcp_sk(sk);
	278
	279	if (list_empty(&msk->rtx_queue))
	280	return NULL;
	281
	282	return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list);
	283	}
	284
7948f6cc FW	285	static inline struct mptcp_data_frag mptcp_rtx_head(const struct sock sk)
	286	{
	287	struct mptcp_sock *msk = mptcp_sk(sk);
	288
a386bc5b	289	return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list);
7948f6cc FW	290	}
7948f6cc FW	291
cec37a6e PK	292	struct mptcp_subflow_request_sock {
cec37a6e PK	293	struct tcp_request_sock sk;
d22f4988	294	u16 mp_capable : 1,
cec37a6e	295	mp_join : 1,
fca5c82c	296	backup : 1;
1b1c7a0e	297	u8 local_id;
f296234c	298	u8 remote_id;
cec37a6e	299	u64 local_key;
79c0949e PK	300	u64 idsn;
79c0949e PK	301	u32 token;
648ef4b8	302	u32 ssn_offset;
f296234c PK	303	u64 thmac;
	304	u32 local_nonce;
	305	u32 remote_nonce;
8fd4de12	306	struct mptcp_sock *msk;
2c5ebd00	307	struct hlist_nulls_node token_node;
cec37a6e PK	308	};
	309
	310	static inline struct mptcp_subflow_request_sock *
	311	mptcp_subflow_rsk(const struct request_sock *rsk)
	312	{
	313	return (struct mptcp_subflow_request_sock *)rsk;
	314	}
	315
6719331c PA	316	enum mptcp_data_avail {
	317	MPTCP_SUBFLOW_NODATA,
	318	MPTCP_SUBFLOW_DATA_AVAIL,
	319	MPTCP_SUBFLOW_OOO_DATA
	320	};
	321
2303f994 PK	322	/* MPTCP subflow context */
2303f994 PK	323	struct mptcp_subflow_context {
cec37a6e PK	324	struct list_head node;/* conn_list of subflows */
	325	u64 local_key;
	326	u64 remote_key;
79c0949e	327	u64 idsn;
648ef4b8	328	u64 map_seq;
cc7972ea	329	u32 snd_isn;
79c0949e	330	u32 token;
6d0060f6	331	u32 rel_write_seq;
648ef4b8 MM	332	u32 map_subflow_seq;
	333	u32 ssn_offset;
	334	u32 map_data_len;
cec37a6e	335	u32 request_mptcp : 1, /* send MP_CAPABLE */
ec3edaa7 PK	336	request_join : 1, /* send MP_JOIN */
ec3edaa7 PK	337	request_bkup : 1,
cec37a6e	338	mp_capable : 1, /* remote is MPTCP capable */
f296234c	339	mp_join : 1, /* remote is JOINing */
0be534f5	340	fully_established : 1, /* path validated */
f296234c	341	pm_notified : 1, /* PM hook called for established status */
648ef4b8 MM	342	conn_finished : 1,
648ef4b8 MM	343	map_valid : 1,
d22f4988	344	mpc_map : 1,
f296234c	345	backup : 1,
d22f4988 CP	346	rx_eof : 1,
d22f4988 CP	347	can_ack : 1; /* only after processing the remote a key */
6719331c	348	enum mptcp_data_avail data_avail;
f296234c PK	349	u32 remote_nonce;
	350	u64 thmac;
	351	u32 local_nonce;
ec3edaa7 PK	352	u32 remote_token;
ec3edaa7 PK	353	u8 hmac[MPTCPOPT_HMAC_LEN];
f296234c PK	354	u8 local_id;
f296234c PK	355	u8 remote_id;
648ef4b8	356
2303f994 PK	357	struct sock tcp_sock; / tcp sk backpointer */
2303f994 PK	358	struct sock conn; / parent mptcp_sock */
cec37a6e	359	const struct inet_connection_sock_af_ops *icsk_af_ops;
648ef4b8 MM	360	void (tcp_data_ready)(struct sock sk);
	361	void (tcp_state_change)(struct sock sk);
	362	void (tcp_write_space)(struct sock sk);
	363
2303f994 PK	364	struct rcu_head rcu;
	365	};
	366
	367	static inline struct mptcp_subflow_context *
	368	mptcp_subflow_ctx(const struct sock *sk)
	369	{
	370	struct inet_connection_sock *icsk = inet_csk(sk);
	371
	372	/* Use RCU on icsk_ulp_data only for sock diag code */
	373	return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data;
	374	}
	375
	376	static inline struct sock *
	377	mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow)
	378	{
	379	return subflow->tcp_sock;
	380	}
	381
648ef4b8 MM	382	static inline u64
	383	mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow)
	384	{
	385	return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq -
	386	subflow->ssn_offset -
	387	subflow->map_subflow_seq;
	388	}
	389
	390	static inline u64
	391	mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow)
	392	{
	393	return subflow->map_seq + mptcp_subflow_get_map_offset(subflow);
	394	}
	395
	396	int mptcp_is_enabled(struct net *net);
93f323b9	397	unsigned int mptcp_get_add_addr_timeout(struct net *net);
b93df08c PA	398	void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow,
b93df08c PA	399	struct mptcp_options_received *mp_opt);
648ef4b8	400	bool mptcp_subflow_data_available(struct sock *sk);
d39dceca	401	void __init mptcp_subflow_init(void);
d0876b22 GT	402	void mptcp_subflow_shutdown(struct sock sk, struct sock ssk, int how);
	403	void __mptcp_close_ssk(struct sock sk, struct sock ssk,
	404	struct mptcp_subflow_context *subflow,
	405	long timeout);
d5824847	406	void mptcp_subflow_reset(struct sock *ssk);
ec3edaa7 PK	407
ec3edaa7 PK	408	/* called with sk socket lock held */
ef0da3b8	409	int __mptcp_subflow_connect(struct sock sk, const struct mptcp_addr_info loc,
ec3edaa7	410	const struct mptcp_addr_info *remote);
2303f994 PK	411	int mptcp_subflow_create_socket(struct sock sk, struct socket *new_sock);
2303f994 PK	412
648ef4b8 MM	413	static inline void mptcp_subflow_tcp_fallback(struct sock *sk,
	414	struct mptcp_subflow_context *ctx)
	415	{
	416	sk->sk_data_ready = ctx->tcp_data_ready;
	417	sk->sk_state_change = ctx->tcp_state_change;
	418	sk->sk_write_space = ctx->tcp_write_space;
	419
	420	inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops;
	421	}
	422
d39dceca	423	void __init mptcp_proto_init(void);
784325e9	424	#if IS_ENABLED(CONFIG_MPTCP_IPV6)
d39dceca	425	int __init mptcp_proto_v6_init(void);
784325e9	426	#endif
648ef4b8	427
fca5c82c	428	struct sock mptcp_sk_clone(const struct sock sk,
cfde141e	429	const struct mptcp_options_received *mp_opt,
fca5c82c	430	struct request_sock *req);
cec37a6e	431	void mptcp_get_options(const struct sk_buff *skb,
cfde141e	432	struct mptcp_options_received *mp_opt);
cec37a6e PK	433
cec37a6e PK	434	void mptcp_finish_connect(struct sock *sk);
b93df08c PA	435	static inline bool mptcp_is_fully_established(struct sock *sk)
	436	{
	437	return inet_sk_state_load(sk) == TCP_ESTABLISHED &&
	438	READ_ONCE(mptcp_sk(sk)->fully_established);
	439	}
a6b118fe	440	void mptcp_rcv_space_init(struct mptcp_sock msk, const struct sock ssk);
2e52213c	441	void mptcp_data_ready(struct sock sk, struct sock ssk);
f296234c	442	bool mptcp_finish_join(struct sock *sk);
ba8f48f7	443	bool mptcp_schedule_work(struct sock *sk);
b51f9b80	444	void mptcp_data_acked(struct sock *sk);
59832e24	445	void mptcp_subflow_eof(struct sock *sk);
1a49b2c2	446	bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit);
5c8c1640	447	void mptcp_destroy_common(struct mptcp_sock *msk);
cec37a6e	448
2c5ebd00 PA	449	void __init mptcp_token_init(void);
	450	static inline void mptcp_token_init_request(struct request_sock *req)
	451	{
	452	mptcp_subflow_rsk(req)->token_node.pprev = NULL;
	453	}
	454
79c0949e	455	int mptcp_token_new_request(struct request_sock *req);
2c5ebd00	456	void mptcp_token_destroy_request(struct request_sock *req);
79c0949e	457	int mptcp_token_new_connect(struct sock *sk);
2c5ebd00 PA	458	void mptcp_token_accept(struct mptcp_subflow_request_sock *r,
2c5ebd00 PA	459	struct mptcp_sock *msk);
c83a47e5	460	bool mptcp_token_exists(u32 token);
f296234c	461	struct mptcp_sock *mptcp_token_get_sock(u32 token);
96d890da PA	462	struct mptcp_sock mptcp_token_iter_next(const struct net net, long *s_slot,
96d890da PA	463	long *s_num);
2c5ebd00	464	void mptcp_token_destroy(struct mptcp_sock *msk);
79c0949e PK	465
79c0949e PK	466	void mptcp_crypto_key_sha(u64 key, u32 token, u64 idsn);
79c0949e	467
3df523ab	468	void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 msg, int len, void hmac);
79c0949e	469
d39dceca	470	void __init mptcp_pm_init(void);
1b1c7a0e PK	471	void mptcp_pm_data_init(struct mptcp_sock *msk);
	472	void mptcp_pm_new_connection(struct mptcp_sock *msk, int server_side);
	473	void mptcp_pm_fully_established(struct mptcp_sock *msk);
	474	bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk);
	475	void mptcp_pm_connection_closed(struct mptcp_sock *msk);
	476	void mptcp_pm_subflow_established(struct mptcp_sock *msk,
	477	struct mptcp_subflow_context *subflow);
	478	void mptcp_pm_subflow_closed(struct mptcp_sock *msk, u8 id);
	479	void mptcp_pm_add_addr_received(struct mptcp_sock *msk,
	480	const struct mptcp_addr_info *addr);
d0876b22	481	void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, u8 rm_id);
b6c08380	482	void mptcp_pm_free_anno_list(struct mptcp_sock *msk);
00cfd77b GT	483	struct mptcp_pm_add_entry *
	484	mptcp_pm_del_add_timer(struct mptcp_sock *msk,
	485	struct mptcp_addr_info *addr);
1b1c7a0e PK	486
1b1c7a0e PK	487	int mptcp_pm_announce_addr(struct mptcp_sock *msk,
6a6c05a8 GT	488	const struct mptcp_addr_info *addr,
6a6c05a8 GT	489	bool echo);
1b1c7a0e	490	int mptcp_pm_remove_addr(struct mptcp_sock *msk, u8 local_id);
0ee4261a	491	int mptcp_pm_remove_subflow(struct mptcp_sock *msk, u8 local_id);
1b1c7a0e	492
f643b803	493	static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk)
1b1c7a0e	494	{
f643b803	495	return READ_ONCE(msk->pm.add_addr_signal);
1b1c7a0e PK	496	}
1b1c7a0e PK	497
5cb104ae GT	498	static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk)
	499	{
	500	return READ_ONCE(msk->pm.rm_addr_signal);
	501	}
	502
456afe01	503	static inline unsigned int mptcp_add_addr_len(int family, bool echo)
1b1c7a0e PK	504	{
1b1c7a0e PK	505	if (family == AF_INET)
456afe01 MB	506	return echo ? TCPOLEN_MPTCP_ADD_ADDR_BASE
	507	: TCPOLEN_MPTCP_ADD_ADDR;
	508	return echo ? TCPOLEN_MPTCP_ADD_ADDR6_BASE : TCPOLEN_MPTCP_ADD_ADDR6;
1b1c7a0e PK	509	}
1b1c7a0e PK	510
f643b803	511	bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
6a6c05a8	512	struct mptcp_addr_info saddr, bool echo);
5cb104ae GT	513	bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
5cb104ae GT	514	u8 *rm_id);
1b1c7a0e PK	515	int mptcp_pm_get_local_id(struct mptcp_sock msk, struct sock_common skc);
1b1c7a0e PK	516
d39dceca	517	void __init mptcp_pm_nl_init(void);
01cacb00 PA	518	void mptcp_pm_nl_data_init(struct mptcp_sock *msk);
	519	void mptcp_pm_nl_fully_established(struct mptcp_sock *msk);
	520	void mptcp_pm_nl_subflow_established(struct mptcp_sock *msk);
	521	void mptcp_pm_nl_add_addr_received(struct mptcp_sock *msk);
d0876b22	522	void mptcp_pm_nl_rm_addr_received(struct mptcp_sock *msk);
0ee4261a	523	void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk, u8 rm_id);
01cacb00 PA	524	int mptcp_pm_nl_get_local_id(struct mptcp_sock msk, struct sock_common skc);
01cacb00 PA	525
6d0060f6 MM	526	static inline struct mptcp_ext mptcp_get_ext(struct sk_buff skb)
	527	{
	528	return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP);
	529	}
	530
648ef4b8 MM	531	static inline bool before64(__u64 seq1, __u64 seq2)
	532	{
	533	return (__s64)(seq1 - seq2) < 0;
	534	}
	535
	536	#define after64(seq2, seq1) before64(seq1, seq2)
	537
5147dfb5 DC	538	void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops);
5147dfb5 DC	539
d5f49190	540	static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk)
e1ff9e82 DC	541	{
	542	return test_bit(MPTCP_FALLBACK_DONE, &msk->flags);
	543	}
	544
d5f49190	545	static inline bool mptcp_check_fallback(const struct sock *sk)
e1ff9e82 DC	546	{
	547	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
	548	struct mptcp_sock *msk = mptcp_sk(subflow->conn);
	549
	550	return __mptcp_check_fallback(msk);
	551	}
	552
	553	static inline void __mptcp_do_fallback(struct mptcp_sock *msk)
	554	{
	555	if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) {
	556	pr_debug("TCP fallback already done (msk=%p)", msk);
	557	return;
	558	}
	559	set_bit(MPTCP_FALLBACK_DONE, &msk->flags);
	560	}
	561
	562	static inline void mptcp_do_fallback(struct sock *sk)
	563	{
	564	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
	565	struct mptcp_sock *msk = mptcp_sk(subflow->conn);
	566
	567	__mptcp_do_fallback(msk);
	568	}
	569
	570	#define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a)
	571
8fd73804 DC	572	static inline bool subflow_simultaneous_connect(struct sock *sk)
	573	{
	574	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
	575	struct sock *parent = subflow->conn;
	576
	577	return sk->sk_state == TCP_ESTABLISHED &&
	578	!mptcp_sk(parent)->pm.server_side &&
	579	!subflow->conn_finished;
	580	}
	581
9466a1cc FW	582	#ifdef CONFIG_SYN_COOKIES
	583	void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req,
	584	struct sk_buff *skb);
	585	bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req,
	586	struct sk_buff *skb);
	587	void __init mptcp_join_cookie_init(void);
	588	#else
	589	static inline void
	590	subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req,
	591	struct sk_buff *skb) {}
	592	static inline bool
	593	mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req,
	594	struct sk_buff *skb)
	595	{
	596	return false;
	597	}
	598
	599	static inline void mptcp_join_cookie_init(void) {}
	600	#endif
	601
f870fa0b	602	#endif /* __MPTCP_PROTOCOL_H */